Perhaps you should try some spelling variations:
"procesos sociology statistical methods." » "procesos psychology statistical methods.", "procesos ecology statistical methods.", "procesos sociology political methods.", "procesos sociales statistical methods."
"process control estadisticas methods." » "process control estadistica methods.", "process control estadistico methods.", "process control statistical methods.", "process control estadisticas metodos.", "process control estadisticas datos.", "process control estadisticas medicas."

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesos sociology statistical methods.") OR ("process control estadisticas methods."))~.
• Removing quotes may allow a broader search: (( procesos sociology statistical methods. ) or ( process control estadisticas methods. ))~.
• Adding a wildcard symbol may retrieve word variants: (("procesos sociology statistical methods.") or ("process control estadisticas methods."))*.